StaticPosPol defines position relative to parent body in polar coordinates, StaticPosXYZ in rectangular. If orbs must rotate with the parent objects, use FixedPosPol or FixedPosXYZ. You may also use planet editor for this. Option NoLighting true disables lighting and eclipse shadows, which improves performance a lot in this scene.

You may also try to make a custom model, import is as a ship, and "land" it on wormhole. It will be fixed on it.

I read the book you set link and he speaks that there is also a second black hole, so there Gargantua, the neutron star and another black hole, you have planned to put soon ?(The Science of Interstellar (page 163))

I am not going to add another black hole. This is not due to laziness or unwillingness this is due to the same limitations surrounding Miller's planet. Black holes are resource hogs and putting in a black hole that orbits another black hole causes massive stuttering, glitching warp effect, and all kinds of other bugs. The system is already poorly optimized and full of issues with a wormhole and a neutron star.

@kham132 and DoctorOfSpaceThis black hole is in fact orbit of Gargantua but even closer to Miller and DoctorOfSpace, you are right (I did not test, just guesswork) because it is located in the 'zone' distorted due to Gargantua, which could led to bugs (I would try that I could).EditI have no concern in FPS (about 13) here is a screenshot and code to added, I do not know what is the name of the black hole so inspiration, I added an s to Gargantua, but I know not aware if it's supposed to be Pantagruel, but I would not then be the name of the neutron star then.